Dynamical Crossovers in Prethermal Critical States
Dynamical Crossovers in Prethermal Critical States
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DOI：
10.1103/physrevlett.118.135701
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发表时间：
2017-03-31
影响因子：
8.6
通讯作者：
Marino, Jamir
中科院分区：
文献类型：
--
作者：
Chiocchetta, Alessio;Gambassi, Andrea;Marino, Jamir
研究了具有N分量序参量和O（N）对称性的相互作用量子场论在动力学临界点附近突然猝灭的预热动力学。根据初始条件，序参数的演变，响应和相关函数，可以表现出普遍的动态缩放制度之间的时间交叉，分别由量子和经典的prethermal不动点，以及从高斯到非高斯prethermal动态缩放的交叉。再加上最近的一个实验，这表明猝灭可以用来探索量子多体系统的非平衡动力学中发生的各种各样的动力学临界点。我们说明了这一事实，通过使用重整化群技术和非微扰大N极限的组合。
We study the prethermal dynamics of an interacting quantum field theory with an N-component order parameter and O(N) symmetry, suddenly quenched in the vicinity of a dynamical critical point. Depending on the initial conditions, the evolution of the order parameter, and of the response and correlation functions, can exhibit a temporal crossover between universal dynamical scaling regimes governed, respectively, by a quantum and a classical prethermal fixed point, as well as a crossover from a Gaussian to a non-Gaussian prethermal dynamical scaling. Together with a recent experiment, this suggests that quenches may be used in order to explore the rich variety of dynamical critical points occurring in the nonequilibrium dynamics of a quantum many-body system. We illustrate this fact by using a combination of renormalization group techniques and a nonperturbative large-N limit.